Buying a Home in Marin County, CA: Transfer Tax, West Marin Growth Controls & Fault Risk

San Rafael's city transfer tax, West Marin's strict growth controls, and the San Andreas Fault running straight through Olema Valley are the things most likely to surprise a Marin County buyer.

Marin County, just north of the Golden Gate Bridge, combines some of the highest home values in California with unusually strict growth controls, particularly in West Marin, where agricultural and coastal land-use rules sharply limit new construction and subdivision. A buyer should understand San Rafael's above-standard transfer tax, West Marin's Local Coastal Program, the county's real seismic and tsunami exposure, and how the county fits into the broader Bay Area commute and financing picture.

What’s the transfer tax in Marin County?

The county base and every city's own statutory share is the standard $1.10 per $1,000 — San Rafael is the confirmed sole exception, adding its own city tax on top for a combined rate of roughly $3.10 per $1,000.

San Rafael adds its own city-level tax of $2.00 per $1,000 on top of the county rate. This has now been confirmed across all eleven incorporated Marin cities — Belvedere, Corte Madera, Fairfax, Larkspur, Mill Valley, Novato, Ross, San Anselmo, San Rafael, Sausalito, and Tiburon — with San Rafael the only one carrying a surcharge; the other ten all sit at the standard combined $1.10/$1,000 rate.

What growth restrictions apply to property in West Marin?

West Marin — Point Reyes Station, Inverness, Olema, Marshall, Tomales, Dillon Beach, and the surrounding ranchland — sits within Marin's certified Local Coastal Program and is subject to some of the strictest agricultural land-use protections in the state.

County policy generally restricts subdivision of agricultural land in the Coastal, Inland Rural, and Baylands zoning corridors unless the applicant can demonstrate the subdivision would enhance the land's long-term agricultural productivity — in practice, a very high bar. The county has been revising its Local Coastal Program (as of 2025-2026) to allow somewhat faster approval for limited-density housing, but the underlying growth constraints remain unusually strong. If you're looking at rural or agricultural-zoned land in West Marin with plans to build, subdivide, or substantially expand a structure, verify zoning and any Coastal Development Permit requirements with the Marin County Community Development Agency before assuming standard buildability.

Has anything changed recently near Point Reyes National Seashore?

Yes — a 2025 National Park Service Record of Decision affected roughly 28,000 acres in and around Point Reyes National Seashore, rezoning approximately 16,000 acres of former agricultural (ranching) land into a Scenic Landscape conservation zone.

This is a federal-land change rather than a private-property zoning change, but it reflects a broader shift away from agricultural use in the immediate area — worth knowing if you're evaluating property near the Seashore's boundary.

Does the San Andreas Fault actually run through Marin County?

Yes, directly — the fault runs through West Marin's Olema Valley from Tomales Bay through Point Reyes Station and Olema to Bolinas Lagoon, and the single largest measured surface displacement along the entire 477-km 1906 San Francisco earthquake rupture (about 21 feet) was recorded near Olema.

At Point Reyes National Seashore's "Earthquake Trail," a fence displaced 18 feet by the 1906 quake remains one of the most visible surface-rupture features in California. This fault trace is Alquist-Priolo zoned: a property inside a mapped zone requires a specific seller disclosure, and new construction for human occupancy within it requires a geologic/soils report before certain permits issue. If you're buying in the Olema Valley corridor — Point Reyes Station, Olema, or nearby — check the specific parcel against the state's Alquist-Priolo maps.

Is tsunami risk a real consideration for bayside or coastal Marin property?

Yes — California Geological Survey tsunami hazard maps cover parts of Sausalito, Marin City, Mill Valley, Tiburon, Corte Madera, Larkspur, and San Rafael on the bay side, plus Stinson Beach and Bolinas on the outer coast.

This isn't hypothetical: the 1964 Alaska earthquake's tsunami caused a death at Bolinas and property damage to buildings, docks, and boats in Sausalito and San Rafael. If you're evaluating a low-lying bayside or beachfront property in Marin, check the current CGS tsunami hazard area maps for the specific parcel.

How does Marin fit into the wider Bay Area commute and financing picture?

Marin is served by the SMART train (Sonoma-Marin Area Rail Transit), and home prices routinely require jumbo financing — the 2026 conforming loan limit here is $1,249,125.

SMART currently runs a 48-mile corridor with 14 stations between Windsor and Larkspur, connecting to a Larkspur ferry terminal for onward travel into San Francisco; ridership as of early 2026 is modest (about 4,400 average weekday riders), and the system is still being built out, so confirm the current station list and schedule rather than assuming a property is transit-connected without checking actual walking distance. Marin sits in the highest FHFA cost tier, with a single-family conforming loan limit of $1,249,125 for 2026 — any loan above that requires jumbo financing, which is common rather than exceptional here. The statewide ADU baseline (Government Code §65852.2) applies countywide, but each city layers on its own permit fees and design standards, so verify ADU rules at the specific city level rather than assuming uniformity.

Disclosure landscape

Confirm San Rafael's added city transfer tax at closing — it roughly triples the standard statewide rate within city limits; no other Marin city carries a surcharge.
Coastal Development Permit requirements apply to new construction, additions, and many remodels in the West Marin coastal zone — verify with the Community Development Agency before assuming standard permitting timelines.
Alquist-Priolo Earthquake Fault Zone disclosure applies to properties within the mapped San Andreas Fault zone through Olema Valley (Point Reyes Station, Olema, and nearby).
Check current CGS tsunami hazard area maps for low-lying bayside or outer-coast Marin parcels (Sausalito, Marin City, Stinson Beach, Bolinas, and similar areas).
Zoning and subdivision rules on West Marin agricultural land are unusually restrictive — confirm buildability before making offer assumptions on rural or ranchland parcels.

Frequently asked

Is Marin County transfer tax higher than the state standard?

It depends on the city. The county base and every city's own share is the standard $1.10 per $1,000, and this has been confirmed for all eleven Marin cities. San Rafael is the sole exception, adding its own tax that brings the combined total to roughly $3.10 per $1,000.

Can I build or subdivide land in West Marin?

It's genuinely difficult. West Marin's Local Coastal Program imposes some of the strictest agricultural land-use protections in California, generally restricting subdivision unless it can be shown to enhance long-term agricultural productivity. Verify zoning and Coastal Development Permit requirements with the county before assuming a project is feasible.

Should I worry about earthquakes or tsunamis in Marin County?

Both are real, location-specific considerations. The San Andreas Fault runs directly through West Marin's Olema Valley (Alquist-Priolo zoned, with mandatory seller disclosure for parcels inside the mapped zone), and CGS tsunami hazard maps cover several bayside and outer-coast communities including Sausalito, San Rafael, Stinson Beach, and Bolinas. Check the specific parcel against current state hazard maps.

Sources

This is educational guidance, not legal advice. Consult a California real estate attorney for legal questions specific to your transaction.